----- Original Message ----- > From: Paul Rudin <paul.nos...@rudin.co.uk> > To: python-list@python.org > Cc: > Sent: Friday, October 21, 2011 3:27 PM > Subject: Re: revive a generator > > > The language has no explicit notion of a request to "revive" a > generator. You could use the same syntax to make a new generator that > yeilds the same values as the one you started with if that's what you > want. > > As we've already discussed if you want to iterate several times over the > same values then it probably makes sense to compute them and store them > in e.g. a list (although there are always trade-offs between storage use > and the cost of computing things again). > >
What if the generator involves a variable from another scope, and before re-generating, the variable changed its value. Also, the generator could be passed in as an argument, so that we don't know its exact expression. >>> vo = 34 >>> g = (vo*x for x in range(3)) >>> def myfun(g): for i in g: print(i) vo += 3 revive(g) #best if revived automatically for i in g: print(i) myfun(g) Yingjie -- http://mail.python.org/mailman/listinfo/python-list
